Mark D.

I am a maths teacher from England - hence I spell things like colour and centre correctly! I came across the site by chance and enjoy doing maths and it's good to help people.

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Level 15 in Algebra Level 11 in Geometry Level 10 in Precalculus Level 9 in Statistics Level 6 in Trigonometry Level 5 in Prealgebra Level 4 in Calculus Level 2 in Chemistry Level 1 in English Grammar